In brief:
Latter half

Obstructive apneas can happen any time you are sleeping, however, in general obstructive apneas tend to be worse during rem sleep.

Rem sleep is more prominent during the latter half of the night. This is different from central sleep apnea, where central apneas tend to be improved during rem sleep.

In brief:
Latter half

Obstructive apneas can happen any time you are sleeping, however, in general obstructive apneas tend to be worse during rem sleep.

Rem sleep is more prominent during the latter half of the night. This is different from central sleep apnea, where central apneas tend to be improved during rem sleep.
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